How to search numbers of a list in a nested list and get its indexes in other nested list?

Question

I declared:

anyNums = [[1,8,4], [3, 4, 5, 6], [20, 47, 47], [4, 5, 1]]#List for find the numbers

numsToSearch = [1, 47, 20]#Numbers to search

rtsian = [0, 2, 3]